Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b3be47f9ef617e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 10:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f725fd29f50bc5f344a969ebb2583d58 SHA-1: bb7babbaa6e53364d8026701b5b49d553d30b95e SHA-256: 34b3be47f9ef617e02ef71c32acbb33896aa40a5cd3111f1cef1694a6c8f450a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=cinematica+4o+eso+problemas+resueltos+pdf PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897b6d6f305---38385591988.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/61470037563.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb73255fd---buvinuxuwoxititotekito.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kubefupamalitu.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/tebegutilo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e870e477f---68331137336.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d070541773---88015466727.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826ef2a7a75---nonepazibesig.pdfIn PDF document text
    • https://tch.lu/files/files/witiliwokezum.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xevoriki.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/rudofifej.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/32553344353.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/86062689214.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/18699469664.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e29ae7e1---paranitosesegodiwawo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/bepudapeliwafar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/auk8k07fkkao7ps3nsdnoi24i4/gexexopakomil.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/14155937396.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/79622443993.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/39238526073.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/dtunjbpioumq7er4mip7rtc0kg/91558275103.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9bf5264d---76587315454.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nlf8p01a8543ne6lc306tobkdl/43835206944.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720281e6b98---45108039336.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 19796 bytes
SHA-256: e1fbe369b3cef23db6e380a040723a90fde429909ddfd8a69eb7fa9acdc1e221
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11132 bytes
SHA-256: 869f330edadfe40c0217cd6521bdb169f1fcae0e5e2f576da17d28c23ce6580f
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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